During the cut-out procedure, what is done to release air from reservoirs?

During the cut-out procedure, what is done to release air from reservoirs?

• A. Release all air pressure from reservoirs by holding the brake cylinder release rod to its fullest travel until the air has exhausted.
• B. Open the reservoir drain valve to vent air.
• C. Pump the brake handle repeatedly.
• D. Close the cut-out cock and wait 60 seconds.

Answer: (A)

The essential idea is to depressurize the system so you can safely separate the locomotive. In a cut-out, you need to exhaust the stored air from the reservoirs, and the way to do that is by pulling the brake cylinder release rod to its fullest travel and holding it there until all air has escaped. This actively vents the air from the reservoirs, ensuring there’s no remaining pressure that could cause an unintended brake application as you detach. Opening a reservoir drain valve would vent air, but it isn’t the standard, complete depressurization method used during cut-out. Pumping the brake handle would add pressure rather than relieve it, and simply closing the cut-out cock and waiting doesn’t remove the pressurized air.

The essential idea is to depressurize the system so you can safely separate the locomotive. In a cut-out, you need to exhaust the stored air from the reservoirs, and the way to do that is by pulling the brake cylinder release rod to its fullest travel and holding it there until all air has escaped. This actively vents the air from the reservoirs, ensuring there’s no remaining pressure that could cause an unintended brake application as you detach. Opening a reservoir drain valve would vent air, but it isn’t the standard, complete depressurization method used during cut-out. Pumping the brake handle would add pressure rather than relieve it, and simply closing the cut-out cock and waiting doesn’t remove the pressurized air.